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      <a id="betarand"></a>
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      <a id="IndexBetarandXClass" class="indexterm"></a>
      <a id="IndexBetarand" class="indexterm"></a>
      <div class="refnamediv">
        <h2>
          <span class="refentrytitle">betarand</span>
        </h2>
        <p>betarand — 
      Beta distribution random number generator (positive values only).
    </p>
      </div>
      <div class="refsect1">
        <a id="idp91836800"></a>
        <h2>Description</h2>
        <p>
      Beta distribution random number generator (positive values only). This is an x-class noise generator.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp91838256"></a>
        <h2>Syntax</h2>
        <pre class="synopsis">ares <span class="command"><strong>betarand</strong></span> krange, kalpha, kbeta</pre>
        <pre class="synopsis">ires <span class="command"><strong>betarand</strong></span> krange, kalpha, kbeta</pre>
        <pre class="synopsis">kres <span class="command"><strong>betarand</strong></span> krange, kalpha, kbeta</pre>
      </div>
      <div class="refsect1">
        <a id="idp91843376"></a>
        <h2>Performance</h2>
        <p>
      <span class="emphasis"><em>krange</em></span> -- range of the random numbers (0 - <span class="emphasis"><em>krange</em></span>). 
    </p>
        <p>
      <span class="emphasis"><em>kalpha</em></span> -- alpha value. If <span class="emphasis"><em>kalpha</em></span> is smaller than one, smaller values favor values near 0. 
    </p>
        <p>
      <span class="emphasis"><em>kbeta</em></span> -- beta value. If <span class="emphasis"><em>kbeta</em></span> is smaller than one, smaller values favor values near <span class="emphasis"><em>krange</em></span>. 
    </p>
        <p>
      If both <span class="emphasis"><em>kalpha</em></span> and <span class="emphasis"><em>kbeta</em></span> equal one we have uniform distribution. If both <span class="emphasis"><em>kalpha</em></span> and <span class="emphasis"><em>kbeta</em></span> are greater than one we have a sort of Gaussian distribution. Outputs only positive numbers.
    </p>
        <p>
      For more detailed explanation of these distributions, see:
      </p>
        <div class="orderedlist">
          <ol class="orderedlist" type="1">
            <li class="listitem">
              <p>C. Dodge - T.A. Jerse 1985. Computer music. Schirmer books. pp.265 - 286</p>
            </li>
            <li class="listitem">
              <p>D. Lorrain. A panoply of stochastic cannons. In C. Roads, ed. 1989. Music machine . Cambridge, Massachusetts: MIT press, pp. 351 - 379.</p>
            </li>
          </ol>
        </div>
        <p>
    </p>
      </div>
      <div class="refsect1">
        <a id="idp91854480"></a>
        <h2>Examples</h2>
        <p>
      Here is an example of the betarand opcode. It uses the file <a class="ulink" href="examples/betarand.csd" target="_top"><em class="citetitle">betarand.csd</em></a>.

      </p>
        <div class="example">
          <a id="idp91856256"></a>
          <p class="title">
            <strong>Example 85. Example of the betarand opcode.</strong>
          </p>
          <div class="example-contents">
            <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac     <span class="comment">;;;RT audio out</span>
<span class="comment">;-iadc    ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o betarand.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>

<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1

<span class="oblock">instr</span> 1  	<span class="comment">; every run time same values</span>

kbeta	<span class="opc">betarand</span> 100, 1, 1
	<span class="opc">printk</span> .2, kbeta		<span class="comment">; look </span>
aout	<span class="opc">oscili</span> 0.8, 440<span class="op">+</span>kbeta, 1	<span class="comment">; &amp; listen</span>
	<span class="opc">outs</span>	aout, aout
<span class="oblock">endin</span>

<span class="oblock">instr</span> 2		<span class="comment">; every run time different values</span>

	<span class="ohdr">seed</span> 0
kbeta	<span class="opc">betarand</span> 100, 1, 1
	<span class="opc">printk</span> .2, kbeta		<span class="comment">; look </span>
aout	<span class="opc">oscili</span> 0.8, 440<span class="op">+</span>kbeta, 1	<span class="comment">; &amp; listen</span>
	<span class="opc">outs</span>	aout, aout
<span class="oblock">endin</span>

<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>
<span class="comment">; sine wave</span>
<span class="stamnt">f</span> 1 0 16384 10 1

<span class="stamnt">i</span> 1 0 2
<span class="stamnt">i</span> 2 3 2
<span class="stamnt">e</span>

<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
          </div>
        </div>
        <p><br class="example-break" />

      Its output should include a line like:
      </p>
        <pre class="screen">
 i   1 time     0.00267:    85.74227
 i   1 time     0.20267:    12.07606
 i   1 time     0.40267:    25.03239
 i   1 time     0.60267:     0.42037
 i   1 time     0.80267:    76.69589
 i   1 time     1.00000:    29.73339
 i   1 time     1.20267:    48.29811
 i   1 time     1.40267:    75.46507
 i   1 time     1.60267:    74.80686
 i   1 time     1.80000:    81.37473
 i   1 time     2.00000:    55.48827
Seeding from current time 3472120656
 i   2 time     3.00267:    57.21408
 i   2 time     3.20267:    30.95705
 i   2 time     3.40267:    19.71687
 i   2 time     3.60000:    64.48965
 i   2 time     3.80267:    72.35818
 i   2 time     4.00000:    49.65395
 i   2 time     4.20000:    55.25888
 i   2 time     4.40267:     3.98308
 i   2 time     4.60267:    52.98075
 i   2 time     4.80267:    58.07925
 i   2 time     5.00000:    56.38914
      </pre>
        <p>
    </p>
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      <div class="refsect1">
        <a id="idp91862960"></a>
        <h2>See Also</h2>
        <p>
      <a class="link" href="seed.html" title="seed"><em class="citetitle">seed</em></a>,
      <a class="link" href="bexprnd.html" title="bexprnd"><em class="citetitle">bexprnd</em></a>,
      <a class="link" href="cauchy.html" title="cauchy"><em class="citetitle">cauchy</em></a>,
      <a class="link" href="exprand.html" title="exprand"><em class="citetitle">exprand</em></a>,
      <a class="link" href="gauss.html" title="gauss"><em class="citetitle">gauss</em></a>,
      <a class="link" href="linrand.html" title="linrand"><em class="citetitle">linrand</em></a>,
      <a class="link" href="pcauchy.html" title="pcauchy"><em class="citetitle">pcauchy</em></a>,
      <a class="link" href="poisson.html" title="poisson"><em class="citetitle">poisson</em></a>,
      <a class="link" href="trirand.html" title="trirand"><em class="citetitle">trirand</em></a>,
      <a class="link" href="unirand.html" title="unirand"><em class="citetitle">unirand</em></a>,
      <a class="link" href="weibull.html" title="weibull"><em class="citetitle">weibull</em></a>
    </p>
      </div>
      <div class="refsect1">
        <a id="idp91874704"></a>
        <h2>Credits</h2>
        <p>
      </p>
        <table border="0" summary="Simple list" class="simplelist">
          <tr>
            <td>Author: Paris Smaragdis</td>
          </tr>
          <tr>
            <td>MIT, Cambridge</td>
          </tr>
          <tr>
            <td>1995</td>
          </tr>
        </table>
        <p>
    </p>
        <p>Existed in 3.30</p>
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